Issues with running the pysocialfoce tests due to wrong path.

[ll7]

This element in the dockerfile

robot_sf_ll7/Dockerfile

Line 17 in cae56e3

RUN ln -s ../fast-pysf/tests pysf_tests

And this element in the readme

robot_sf_ll7/README.md

Line 55 in cae56e3

ln -s ../fast-pysf/tests pysf_tests

try to execute the tests from pysocialforce/tests during the testing of robot-sf. However, the pathes are not adapted.

In the future, this should be modified, such that we can use relative pathes to the file location.

[ll7]

Not that important, because test can be run seperately in pysocialforce.

[ll7]

=================================================================== short test summary info ===================================================================
FAILED fast-pysf/tests/test_map_loader.py::test_load_map - FileNotFoundError: [Errno 2] No such file or directory: 'tests/test_maps/map_regular.json'
FAILED fast-pysf/tests/test_map_loader.py::test_load_map_with_invalid_file - FileNotFoundError: [Errno 2] No such file or directory: 'tests/test_maps/invalid_json_file.json'